articleJournal of High Energy PhysicsAug 1, 2017DIAMOND OA

Test of lepton universality with B 0 → K *0 ℓ + ℓ − decays

RAR. AaijBAB. AdevaMAM. AdinolfiZAZ. AjaltouniSAS. Akar
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Abstract

A test of lepton universality, performed by measuring the ratio of the branching fractions of the B 0 K * 0 + -and B 0 K * 0 e + e -decays, R K * 0 , is presented. The K * 0 meson is reconstructed in the final state K + -, which is required to have an invariant mass within 100 MeV/c 2 of the known K * (892) 0 mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb -1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, q 2 , to be R K * 0 = 0.66 + 0.11 -0.07 (stat) 0.03 (syst) for 0.045

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Authors

789
  • RA
    R. AaijCorresponding
  • BA
    B. Adeva
  • MA
    M. Adinolfi
  • ZA
    Z. Ajaltouni
  • SA
    S. Akar

Topics & keywords

Keywords
  • Lepton
  • Branching fraction
  • Invariant mass
  • Universality (dynamical systems)
  • Meson
  • Invariant (physics)
  • Luminosity
  • B meson
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